Transient helium heat transfer phase I—Static coolant
Transient helium heat transfer phase I—Static coolant
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瞬态氦传热第一阶段——静态冷却剂
DOI：
10.1016/0017-9310(78)90178-3
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发表时间：
1978
影响因子：
5.2
通讯作者：
W. G. Steward
中科院分区：
文献类型：
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作者：
W. G. Steward
已经获得了静态液体和超临界氦中平面加热表面的瞬态传热数据。测量在步进功率输入后 2(10)−5s 开始，覆盖热通量范围 0.05–20 W/cm2、压力 0.09–0.3 MPa 以及四种不同的加热器方向。初始传热系数主要受到 Kapitza 阻力的限制，比稳态大 10-100 倍，达到稳态的时间从 10−5 到 1 秒不等。对于低于稳态峰值核沸腾极限的热通量，温度遵循基于稳态核沸腾水平的纯传导的计算。超过该限制，瞬态传导期会导致明显的亚稳态成核期，然后过渡到薄膜沸腾。
Transient heat-transfer data have been obtained for flat heating surfaces in static liquid and supercritical helium. Measurements start 2(10)−5s after step power inputs, and cover a heat flux range of 0.05–20 W/cm2, pressures from 0.09–0.3 MPa, and four different heater orientations. Initial heat-transfer coefficients, being limited primarily by the Kapitza resistance, are 10–100 times greater than steady state, and the time to reach steady state varies from 10−5to 1s. For heat flux below the steady state peak nucleate boiling limit the temperature follows calculations based on pure conduction to the steady state nucleate boiling level. Above that limit the transient conduction period leads to an apparent metastable nucleation period followed by a transition to film boiling.